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from fc5de306107 [llvm-objcopy] Delete redundant !Config.xx.empty() when fol [...] new 1efb7b466e6 [GlobalISel] LegalizationArtifactCombiner: Combine aext([as [...] new 52c21589999 [TableGen] Examine entire subreg compositions to detect ambiguity

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Summary of changes: .../GlobalISel/LegalizationArtifactCombiner.h | 12 +++ test/CodeGen/AArch64/GlobalISel/legalize-ext.mir | 62 ++++++++++++++- test/TableGen/ambiguous-composition.td | 92 ++++++++++++++++++++++ utils/TableGen/CodeGenRegisters.cpp | 64 +++++++++++++-- 4 files changed, 221 insertions(+), 9 deletions(-) create mode 100644 test/TableGen/ambiguous-composition.td